//vararr2d.c -- functions using VLAs
#include <stdio.h>
#define ROWS 3
#define COLS 4
int sum2d(int rows, int cols, int ar[rows][cols]);
int main(void)
{
	int i, j;
	int rs = 3;
	int cs = 10;
	int junk[ROWS][COLS] = {
		{2,4,6,8},
		{3,5,7,9},
		{12,10,8,6}
	};

	int morejunk[ROWS - 1][COLS + 2] = {
		{20,30,40,50,60,70},
		{5,6,7,8,9,10}
	};

	int varr[rs][cs]; // VLA

	for (i = 0; i < rs; i++)
		for (j = 0; j < cs; j++)
			varr[i][j] = i * j + j;

	printf("3x5 array\n");
	printf("Sum of all elements = %d\n", sum2d(ROWS, COLS, junk));

	printf("2x6 array\n");
	printf("Sum of all elements = %d\n",sum2d(ROWS - 1, COLS + 2, morejunk));

	printf("3x10 VLA\n");
	printf("Sum of all elements = %d\n",sum2d(rs, cs, varr));

	return 0;
}

// function with a VLA parameter
int sum2d(int rows, int cols, int ar[rows][cols])
{
	int r;
	int c;
	int tot = 0;

	for (r = 0; r < rows; r++)
		for (c = 0; c < cols; c++)
			tot += ar[r][c];

	return tot;
}